Btrfs: factor page private preparations into a helper

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 6 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 88b3ef20be69..0df325f89d62 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -652,12 +652,7 @@ static int btrfs_cow_one_page(struct inode *inode, struct page *page,
         u64 page_start = page->index << PAGE_CACHE_SHIFT;
         u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
 
-        if (!PagePrivate(page)) {
-                SetPagePrivate(page);
-                set_page_private(page, 1);
-                WARN_ON(!page->mapping->a_ops->invalidatepage);
-                page_cache_get(page);
-        }
+        set_page_extent_mapped(page);
 
         lock_extent(em_tree, page_start, page_end, GFP_NOFS);
         set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,